I do agree that it does seem a bit sudden for Ren to jump straight to "Let's go to a love hotel!"
She seems to have a strong attachment, (prefers Hime over her brother now) and an attraction to Hime (fantasizing about how hot she'd look in lingerie) so Hime's coming out probably made a light bulb go "She's gay! I don't have to be my brother to do all kinds of things with her." Plus it seems like Ren's been looking for a way to strengthen her bond with Hime and make it permanent.
#justhornyteenagerthings
...does make you wonder just how long she's been lowkey lusting after Himeno's glorious gams tho. Floodgates opened etc.
I know right? I wonder just how far in her fantasies did she get with Himeno?
On another note Ren's wildly teleporting bangle(s) keep throwing me off. One frame they're there, another they've suddenly switched wrists, third they're nowhere to be seen. Sometimes on the same page too. >_<
Lol. Magical bangles.