Puchi Puri
I don't like shotacons but this was pretty dang cute. Guy is crying on a bench in the rain after confessing and being horribly rejected, when a elementary school kid come upon him. The kid falls for him pretty much right away and wants to protect him. They start dating but it's pretty innocent, for the most part, because the kid is so young, nothing beyond a few sweet (not pervy) kisses. It does flash forward a couple times and you get to see the kid all full-grown and being the seme. Then there's an unrelated chapter at the end that's also an age-gap story about a salaryman dating a high school boy but feeling pretty insecure because of their age difference.
Yoake wo Matsu Kimi no Tame ni
Ah!! Shocking ending of chapter 1! Didn't see that coming! This is about a guy, named Nao, who's nearing 40, who knocked up someone from a drunken one-night stand even though he's gay, and has pretty much spent his whole life trying to support his son secretly. So, when he gets asked to go out clubbing with friends he caves in, and there he meets Touma, a much younger guy who's new to the gay-clubbing scene and wants to lose his virginity.
Kasa No Shita, Futari