Honestly, these two being intimate in this kind of way just feels wrong to me. Like, I think the two absolutely love each other dearly, just not like this.
Yeah, it feels out of character. I think their relationship is closer to Rin x Nadeshiko, which is not as intense despite all the tents jokes
^I don't think it is happens every sunday. It is happens ever day other than than Sunday. Sunday is the day when they both confess their sins and then doing it again in Monday