In the Momoiro series:

V.1 - Momoiro Junjou Danshi (Purehearted Boys)

V.2 - Momoiro Renai Jijou (Love Circumstances)

V.3 - Momoiro Himitsu Danshi

"Somehow, over the summer, Yamaguchi ended up going out with his best friend, Takagiri. But now that they're together, something's really been bothering Yamaguchi; why does Takagiri love him so much? Is it his shaggy hair that begs to be petted? His often stubborn personality? Or the way he blushes when lavished with Takagiri's umm...affection?!

In any event, Yamaguchi's insecurities are really putting a strain on their relationship. Seems like he's pretty nervous about fulfilling Takagiri's more carnal needs when his mind is pre-occupied with other things. While Takagiri would like nothing more than to drag Yamaguchi to the nearest closet and have his way with him, it seems like our seme is going to need a little bit of help to calm his nervous little uke.

Aco Oumi's Love Circumstances is a delightful romp about the trials of young love. Will Takagiri be able to convince Yamaguchi that he loves everything about him? Or at least distract him long enough to get him into bed?" (DMP)