Surprise at the cinema

My girlfriend went to the cinema and we got a sexy surprise.

This happened several years ago. Me and my girlfriend decided to go to the cinema to watch a movie that was highly rated. We were given seats on the side where I sat beside the wall and Gloria sat next to me on my left. We had kissed passionately during the early part of the film and we had touched each other as we kissed. My cock was rigid and her cunt had been quite moist. It must have been an hour into the main film when Gloria nudged me, I had been engrossed in the plot. She quietly said, "A man has just come and sat beside me, he's stroking my thigh and trying to feel my fanny, what shall I do?" I leaned forward to look at him. He was older than us, probably in his late twenties he had dark hair and looked to be bigger than me. I asked her, "How far has he got, does it feel nice?" She replied, "He's got his hand on my stocking top and he's stroking my bare thighs. Shall I let him touch me? It feels exciting!" I felt my cock harden again and the thought of her being fingered by this stranger excited me too. So I said, "I reckon you want him to, don't you? So let him." She didn't say anything, so I looked at her legs and watched as she began to part them slowly. I saw his right hand go between her parted legs and up to her dripping cunt, then I looked at the expression on her face. I could tell she was enjoying it as she began to breathe heavily closed her eyes. The man was fingering fucking her quite fast and I knew she would be wetter than usual because of it. I didn't see it, but he had taken his cock out and Gloria was wanking him. It didn't last long, maybe four or five minutes when they had stopped. He got up and walked away. Later we got the bus back to hers and I asked her if she had enjoyed it. It was then that she told me that she'd given him a hand job. I asked if he had a big cock and she said it wasn't as big as mine, but it was really stiff and he had cum in his handkerchief. When we got in the passageway to her house, we did our usual knee trembler against the wall. Whist thrusting I asked if she would have fucked him, if she got the chance to. She replied, "I don't know." To me that meant she would have. After that, I thought she was a slut. To be honest, she was the best fuck I've ever had and I would have married her, but events spoiled that and we went our separate ways. I was told by a friend that he had a mate who went out with her who would have another lad fuck her and he would have sloppy seconds. I have always been attracted to the slutty kind of woman.