Hope no one minds I tweaked the dialogue a bit. "In the mouth" or "In the ass" doesn't seem to fit Koizumi's general demeanour (not that anything about his behavior in these strips does, but at least he still presents himself in a Koizumi-esque way).
This is exactly what I thought of after the parent post.
However!there's no reason for it to be a problem!Hmm, to be sure......the contraceptive technologies of this era are a cause for concern.If you did it orally or anally,I would be in big trouble if I got pregnant!Itsuki Koizumi's Brilliant IdeaButbutbut!