Marcus is a cool dude and he's having lots of fun with noirin at the end of the day she is just as bad using marcus as a safety blanket when she stuff's up e.g(bunnygate) she constantly runs to him and she also asks marcus to jump into her bed
I think she genuinly likes him but is afraid to let it go a tad further because of what "other" h/m's have said in the past
It takes 2 to act like a couple and imo they are putting on a good show