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The Appearance of an Erection

S-kun's penis, gradually stiffening upon seeing his naked sister

In its normal state, S-kun's penis is up to 6 cm long. Due to phimosis, his excess foreskin is tapered at its tip.

Fully Erect

Half Erect

The loose skin gradually stretches...

The tip is still only slightly exposed.

S-kun's penis is up to 12.5 cm when erect, slightly shorter than average.

S-kun's penis doesn't truly suffer phimosis, so his skin can be peeled back.

The corona is relatively small.

The head of his penis is a nice pink in colour, and especially sensitive.

Sister's Vagina

Pubic Hair
Rather dense

Clitoris
A small one, quite sensitive

Inner Labia
With a little stimulation, they turn a vibrant pink

Urethral Opening
Has never seen sexual action, but if S-kun insists, she's willing to try something

Vaginal Opening
The entire cavity, especially the one seen above, is coarse and lined with bumps, which will press onto S-kun, making him almost delirious with pleasure

Anus
Attempted anal a few times, and enjoyed it considerably

Inner Vagina
Roof lined with small beads

Uterus

Butt Side

Stomach Side

G-spot