Lisa and I had been drinking heavily but Ian was driving and had stayed sober despite buying most of the drinks. We said our 'goodnights' and went to our own rooms. Lisa closed the door behind us, came up to me and kissed me full on. She then whispered in my ear "how do you fancy a threesome with Ian?". We had previously discussed what it might be like in bed with another girl, but not with another man. I was somewhat uncertain so I said "I think maybe I'm not ready for that yet". "OK" said Lisa and she proceeded to grab the button of my jeans, undo my fly and in one deft move took down my jeans and undies and dropped to her knees. She held me with one hand and gently flicked her tongue across the tip of my rapidly swelling cock. I dropped to the bed with just my legs hanging over the end whilst she went to work with her hands and mouth. She was alternating between a number of long firm strokes followed by gentle sucking and swirling her tongue around the tip. I was trying my best to keep quiet but when she started moaning I couldn't help but join in. Within minutes I was filling her mouth with my cum and she sweetly swallowed every drop. Mmmm, she said licking her lips, that was good but now I'm really horny, are you sure we can't join Ian next door?, he's been so kind to us whilst we've been here". I grinned at her, "OK, you get your way". So we got up, kissed once more, and headed slowly to the neighbouring room where Ian was lying under the covers, naked.