BL, especially shouta, would never have gotten a Shogakukan Manga Award (it's pretty prestigious, inasmuch as manga awards go anyway)—which is to say, this should be nominally safe all the way through.
...having said that, the cover sets all sorts of alarms for me, to the point where I A.) have to wonder if it wasn't intended as bait for a certain audience and B.) haven't quite managed to bring myself to read it yet, even though it's almost definitely actually wholesome.