I Thot You Was a Toad's manga / #twincest(3)

Twincest story about a young man who pretends that every sexual encounter he has with his twin brother is because his brother is dreaming, and what happens when he discovers that his brother is wide awake.

Threesome, twincest, masturbatio-not-quite-interruptis, self-lubricating butthole, PWP ...

Twins compete for academic superiority with an unusual prize at stake.