I had previously mentioned that this manga would not have sex, and the likely reason was Rinka. This was something that was not in the webnovel explicitly, in fact, MC would be totally want to go for it, and had many opportunities to do so, but he always ended up in a situation like "I must be a gentleman" and "She can't really mean it", and the situation would lead to him not doing it.
I do prefer him outright saying "I'm saving myself for Rinka" than all the stupid situations that he misses later, cause they do get on your nerves after they repeat so many times.