Think about Molly's views on consent for a second. That if Sensei had fucked her while she was passed out, it wouldn't have been rape because "she wanted it." Then think about how she powered right through Rin's crystal-clear "no" to kiss her anyway.
She's already proven willing and able to ignore the lack of consent and has flawed notions of what does and does not constitute rape thanks to the media she's consuming.
Yeah, the potential for her to be an even more toxic partner is right there in front of us.
That's not how she saw the Sensei thing. She claims to think that Sensei didn't rape her, and never did she say it wouldn't be rape.
She just wouldn't hate him for cumming on her, and actually asked Sensei to make sure she's conscious the next time:
Still, the whole okay with rape thing doesn't actually exist. That's Kirin. (Of course this whole Molly situation still has some mystery surrounding it)
The kiss thing was a shitty thing to do though, even if it was due to spinning the bottle. Ayane did similar to Ami. Rin actually kind of did similar to Otoha as well, just they were technically dating for a few seconds, and no bottle was needed.
It's not like Molly is going around forcing Rin to kiss her 24/7 or anything, though, and if they were in a relationship, I highly doubt Rin would be against it, let alone desperate for affection like she is and has been, with Otoha.
To be frank, I highly doubt Rin would be calling Molly a "fucking prude" like she did Otoha:
If anything, Molly's impulsiveness would probably make the relationship better, and Rin wouldn't be needing to feel wanted:
The main problem with Rin x Molly is Rin's lack of attraction towards Molly. It's not like Rin isn't into the things Molly is. Heck, she seemed interested in seeing Molly's questionable material in her obviously porn folder:
They are both impulsive perverts.