サーナイトおねえちゃんの胸の突起でショータくんの股間を支えたらいかがわしい絵面になるけど
精通してないから大丈夫だと思うし仮に精通しても未来予知できるし口の位置もちょうど良いから大丈夫だと思うしっ

If Shōta-kun were supported between the legs by the protrusions on Sainight-oneechan's chest, it would make for a rather suggestive picture.
But I reckon it's fine since he hasn't reached puberty yet, and even if he did, he can foresee the future, plus the position of her mouth is just right, so I think it's perfectly alright.