Gee, I didn’t think that Marco’s nipples would offend anyone, but okay.
There’s no nudity; no inappropriate, overly scant outfits, and no grotesque exaggeration of any part of the characters. I keep my content PG. PG-13, tops.
Far more tasteless, inappropriate art of underaged characters are plenty elsewhere, but there’s none of that here. If Tumblr and its new system can handle teens doing things teens normally do outside of the bedroom, you certainly can.
Full disclosure: An upcoming art piece is going to push that line, I’ll admit. It’s been extensively tested by my patrons and other neutral parties to be teen-appropriate. So, brace positions, everyone.