The only things I remember about it was this:
-The guy had a big dick(even for hentai) and got picked on for it.
-He wouldn't have sex with his gf because of it.
-She didn't find out til one of the huy's friends tried to NTR him with his girl and take the main guys's gf.
-The guy with the monster dick manages to have sex with his gf at the last second and they are saved.However, the almost NTR-ing bastard's girl ends up leaving him right there for the monster dick.
Can anyone help me?