Suki Sugiru kara Hayaku Dake

Kaname, a college student, has been dating his handsome and athletic boyfriend, Ren, for half a year. His loyal younger boyfriend dotes on Kaname lovingly every day, but Kaname is worried that they still haven't had sex yet. When he tries to tempt Ren in every way possible, Ren just ignores the attempts... Until one day, when one of Kaname's friends tells him about a spell that would let him "fulfill his desire in dreams." When he skeptically tries it, he dreams of Ren doing all sorts of naughty things!?

(Source: Libre, translated)

Note: Includes two extra chapters.