Yamada and Kase-san has set the bar pretty high for cute, wholesome, lovey-dovey sexy sex, so I’ll be interested to see how Nakatani handles the intimacy issue.
And I agree, physical desire has been a significant aspect of Touko’s character from the start, and Yuu has been fairly on-board with it herself, within the quirky parameters of their (previous) relationship.
I must admit I wouldn’t mind seeing one of those by-now conventional Internet-search “How do two girls have se—OMFG!!!!” scenes, with Rei as backup.