HELP!

Hey I need your help
I am searching for a manga I read a long time ago... it is about a shy boy who confess - I think more or less on an impluse - to a popular guy, he says yes cause he has no one at the time... so they have sex.. I think the shy boy gets his nipple pierced... they are also in university already... an the popular guy falls in love (for the first time?) with the boy... and the end the popular one celebrates christmas with the shy guy in a hotel where he tells him he loves him... or so
thank you very much