Does the cousin and his friend had a story??
Not as far as I know, but there is a prequel involving seme and his brother.
NAME PLEAAAASE ≧ω≦
Nvm I found it XD.. I didn't know it was mentioned in the summary ꉂ(ˊᗜˋ*)
Mitasareru Kuchibiru. Its in the description.
Does the cousin and his friend had a story??