Since getting her nipples pierced, Mona had discovered that they were more sensitive and combined with the cold and it being Alex, it almost hurt for him to touch them.
She didn't mind any sort of that pain.
He was hard and ready, and that was all the encouragement that Mona needed to rise up off the lounge and without any sort of embarassment remove her jumper. The cold of the air hit her skin like a slap, for she was naked underneath.
Taking out her wand, she cast a warming spell over them both.
"You know what's really naughty?"
Mona transfigured her jumper into a huge blue blanket that covered both her and Alex on the lounge, with plenty of room to spare. She grinned at the inquisitve look on Alex's face.
"The possibility of getting caught," she whispered as she straddled his hips and covered them both.
"No detection charms. No cloaking spells. Fred and George could come up any moment to check on us. Hell, there could be someone watching us right now."