You and Mariam both know you like each other, but nothings ever changed. Not yet at least

You were talking with Mariam and your friends, when you started feeling a little tired. You glanced around for a seat, but all were taken. Mariam, noticing you looking for somewhere to sit, pats her lap

You looked at her skepticly, but she was waiting, so you sat down on her lap. No one noticed, so she took the opportunity to slip her hands over your hips, down to your thighs, holding you in place