I'm lowkey thinking that the dude is gonna burn down the hotel room thinking it's Sakurai's room but it's actually his father's (since he did say he's not going home for a while).
Could also be Sakurai arranged to meet the dude's father in the hotel room but she won't actually show up as the...
I like how the MC doesn't drag on being all shy and being "No no no, I can't say that to a woman!" kinda biz. Nope, he just goes straight for the "I want to lick you" like the gigachad he is.