I saw the animation... I was like "Who give the green light to this piece of crap?" It was just so bad. In my opinion the worst hentai of all time! Avoid watching it!
But the manga is a different story I was afraid of the NTR tag (I can tolerated NTR but is not my thing.)
1.Offside Girl Childhood friend setup was more cheating than stealing the one you love (The stealing never happen) then again when the two of them (MC & Heroine) did the same thing plus they don’t mind shearing each other I can’t even consider that cheating…
Pudding & 4. Milk Pudding, Onii-chan scenario it was very Vanilla.
3. Together As One was also good I really enjoyed when the Pair of MC took action, a very rear occurrence in this types of manga settings.
If you have time to spare give it a try!