We both entered the bedroom where Ian was waiting as if some pre-planning had been going on. Lisa and I undressed and slid into the bed with Lisa sandwiched in the middle. Ian and I started to caress Lisa starting with arms and legs then breasts. I was like a kid showing off his favourite toy showing Ian all the right buttons to push as we gradually worked our way to what was becoming a very damp patch between her legs. We took it in turns to rub her clit or push a finger inside her and Lisa was soon moaning loudly . It was at this point that Lisa sort of took over, turning round and kneeling to face us. She had a beaming smile as she took one cock in each hand and started rubbing us both. Then she leant forward to take Ian in her mouth, which I was finding very arousing. This seemed to be my cue to get behind her and slide my now throbbing member into her. We managed to get a good rhythm going with each of us getting rubbed nicely where we wanted. Lisa moaned louder and this triggered me shooting my second load of the evening into her pussy. She said 'time to change round boys' so I lay back allowing Lisa to lick my soaking cock while Ian entered her from behind. I was enjoying the view of having my girlfriend pounded while she sucked me but things were about to start to go wrong.