The moment she said that because it’s them it won’t turn lewd, she jinxed it. They’re going to end up making out at some point.
Also, besides the friend seems to be more possessive rather than in love with her, so we won’t get a love triangle. She seems pissed off because 1) Less time with her friend who she sees as something to monopolise; 2) It’s an older woman so she thinks it’s wrong and therefore as her protector she should stop this.
Finally, really wholesome moment with the loner feeling weird about having a friend and not knowing why she’s smiling