About Mahiru - Amane relationship

In my opinion, the ideal solution to the... intimacy problems Mahiru and Amane are currently experiencing, with her wanting to go further but him holding back for fear of pregnancy, is non-penetrative sex. There are all kinds of non-penetrative activities, such as oral sex, fingering, handjobs, paizuri, etc., that both could practice without fear of pregnancy.

And there are many mangas that explore this same idea. To give an example, in the manga Nozoki Ana, the MC couple doesn't have penetrative sex until practically the last chapter, but the FMC gives fellatio to the male MC many chapters before the end, and he does fingering to her.

Another example is Jubunoichi no Hanayome, where the male MC lets the waifus in his harem give him blowjobs and handjobs, but he stops them when they want to have penetrative sex with him, since he only wants to do it with the girl he's going to choose as his fiancee.

What do you think? Do you think this would allow Mahiru and Amane to "cool off steam" until they both turn 18?