Nope. Comiket Service tends to accidentally lump lots of doujin into the porn category because, well. That's most of what they sell. The one you've linked there is a harmless collection of scripts for Haibane-Renmei.

(He's done some pieces that have tasteful/artistic nudity in them, and he often sticks non-porn gag comics in the middle of the porn-filled Muteki-Fire anthology doujins, but so far as I know, no actual porn.)

So, if he didn't draw porn, then what's the "sexual schene" that is apparently "featured" in this doujinshi of his?

There isn't any - they mislabeled it. They do that a lot.

Example: here's the second of the original Haibane-Renmei doujins. Check the description.

http://www.comiketservice.sakura.ne.jp/a9/937-e.htm

Once again, they say it has "Sexual Schene Featured."

...now, assuming I've seen the same doujin as they're selling, there wasn't anything even vaguely sexual in it.

Maybe a "sexual schene" is different from a "sexual scene". :P

Anyway yeah, it seems that they just suck at classifying their doujinshi.

Since someone mentioned porn -

I don't feel like any HR hentai, but if anyone has any light shouho-ai of the cast, esp. Rekki/Rakka, please share. I mean stuff like holding hands and blushing, a little kiss, things like that. I've got the one of them kissing in the snow. thx!