Sirius grinned when she approached, sitting up and opening up his blanket for her to join him in the warmth, licking his lips as she brought his usual meal. "Oh man, this smells delicious! You always know the best things to bring Alysia!" He immediately dug in to hte food, then grabbed the flask of drink, gulping some of it down.
Unknown to both of them however, Snape had managed to have some minor interference. Whilst Alysia had been in the kitchens, she had not been alone. Snape had also been there, and had slipped a little something into the flask, a very special potion. He had laced it with a love potion that had been intended for a student, one that would ensure it only made her fall in love with the first adult she saw, not a student. Snape had no idea who she was spending her time with after all.
When Sirius drank it however, it had an immediate effect. He blinked as he set the flask down, looking over at Alysia slightly strange, then grinned and suddenly grabbed her, pulling the girl close and suddenly kissing her. "You are so beautiful....oh you are the most beautiful woman in the world....." He leaned around to kiss her ear. "I love you so much Alysia...."