I thought it was just a simple incident.

    A happening caused by curiosity.

    A happening that occurred because I left the sensitivity setting on.

    I thought that was all it was.

    But...

    "Brother... can I touch your penis?"

    After that day, Sophia started seeking out my penis.

    ====

    As usual, I was comforting a gloomy Sophia by stroking her head when she suddenly said she wanted to touch my penis.

    "...What?"

    "Can I touch your penis? Ugh... why do you make me say it twice and embarrass me!"

    "Why do you want to touch my penis and feel embarrassed?"

    "It''s just... when I touched your penis that time, it felt strangely good..."

    That''s what it was.

    Sensitivity stimulation.

    That was the problem.

    I had habitually turned on the sensitivity setting when my penis was touched, and I shouldn''t have.

    "Huh? Stroking my head feels somewhat lacking... can I touch your penis, please?"

    "Sophie... you have Siu."

    "Ugh... this is... just to feel better! I was upset because of someone else in the first place!"

    Ah... so that''s how it became.

    I inadvertently trained Sophia.

    Every time Sophia felt down, I comforted her with sensitivity stimulation.

    Thus, whenever she felt down, she began seeking sexual pleasure.

    That''s why, even knowing that touching my penis was a sexual act, her body craved it.

    I had no choice. I made her this way, so I have to take responsibility.

    It''s definitely not because I have ulterior motives.

    I never intended to pursue the main heroine.

    "Alright... here."

    As I exposed my penis, Sophia reached out eagerly to touch it.

    "Hehe...! It''s weird. Why does it feel good to touch a penis?"

    "Sophie, you''re a pervert... Ouch! You!"

    Jokingly, I made a remark, and Sophia suddenly grabbed my balls.

    I screamed in unexpected pain.

    "The pervert is you, brother! Be quiet before I tell dad!"

    It seemed she still held that day''s incident close to her heart.

    Fair enough.

    Since I was the one who sinned, I decided to keep quiet.

    Instead, I took Sophia to the bed.

    "What, what are you doing?"

    "See, isn''t this more comfortable?"

    I sat on the bed, leaned back against the wall, and pulled Sophia onto my lap.

    By inserting my knees between her legs and spreading them, her dress slid down to her hips, revealing her thighs.

    As I lowered Sophia, my penis touched between her legs.

    I could feel the soft fabric of her panties.

    In that position, one hand wrapped around her shoulder and the other stroked her head.

    After a few twitches, Sophia seemed to adapt and soon began moaning softly as she played with my penis.

    "Hehe-? Heh-? Definitely much more comfortable. Hehe."

    "Right?"

    The scent of a girl her age wafted from the Sophia cradled in my arms.

    As I brushed her hair back, her pale neck was exposed.

    "Ha... Sophie, you..."

    "Hehe... brother, I made you... ha... do it?"

    Sophia smiled as if she had won, then played with the semen that had stained her dress.

    "So this is... semen..."

    Then she quickly brought it to her mouth and swallowed it.

    "...Sophie?"

    "Ew! Gross!"

    "Of course it is... why would you eat that?"

    "Just... thought it might taste good since it''s yours... hehe."

    "You really are..."

    That broke the mood.

    I was about to go all the way just before climaxing, but now I had cooled off.

    This is what they call post-climax clarity.

    Instead of continuing, I lay down on the bed and pulled Sophia into a hug.

    Sophia nestled into my embrace without resistance.

    After spending some time like this,

    I belatedly came to my senses and washed the soiled sheets and clothes.

    ====

    The similar days repeated.

    Whenever Sophia felt down, I''d expose myself, and when I ejaculated, Sophia would climax...

    A month passed like this.

    Recently, touching my penis wasn''t enough for Sophia, and since last week, she started giving oral.

    And from today...

    "Yawn... slurp, tsch, lick, ha... lick."

    She decided to give me morning fellatio.

    "Ah! Did you wake up? Hehe... feels good to start the morning like this, right?"

    It''s a strange feeling to have your penis sucked first thing in the morning.

    I responded that it felt good and stroked Sophia''s head.

    Then Sophia, delighted, focused on sucking my penis.

    Initially, Sophia didn''t know what to do when she bit into my penis,

    But now, if I let my guard down, she could make me climax immediately.

    "Ugh, Sophie, I''m going to come!"

    As I ejaculated in Sophia''s mouth, she savored the semen, chewing it in her mouth.

    Initially, she said it tasted bad, but recently, she liked it, saying it had a strange addictive quality that reassured her, likely influenced by the sensitivity stimulation.

    Gulp-!

    "Ha... swallowed it all. Hehe."

    Sophia seemed happier than I was after having her mouth filled.

    I pulled Sophia in and embraced her from behind while fondling her breasts.

    "Kyah! O, brother! Stop!"

    I pretended not to hear and didn''t stop.

    Perhaps because she was meant to be a saint, the maternal warmth and beauty from her breasts were great.

    "Ha... stop it!"

    Sophia fled from my embrace. Even from a brief caress, she was aroused, her nipples erect.

    "It''s embarrassing, really..."

    Noticing this, Sophia crossed her arms over her chest, covering her erect nipples.

    "Isn''t sucking my penis not embarrassing?"

    "That, that''s different! This is this!"

    And with that, Sophia ran away.

    I was stealthily trying to caress her, but surprisingly, she was hard to breach.

    She would suck my penis but wouldn''t let me touch her elsewhere—is this some new kind of torment?

    But knocking persistently might open the door.

    I think I can conquer her before we leave for the adventure.

    The main heroine?

    I just want her. I can''t help it.