I'd say feeling natural doesn't seem like much of an issue. These people knew each other for quite some time before, so reaching some degree of sexual interaction in the span of less than a month doesn't feel very unnatural. They wouldn't reach the same level as Dean for sure, but some fooling around seems possible if nothing else.
Don't take this as an endorsement from me though. I prefer the romance aspect myself, I don't care much for the sexual content. Just throwing my two cents on the matter.