When I was 18 or so, I took my girlfriend of the same age to the local cinema on the pretext of watching some soppy film or other. Matinees tended to be pretty poorly attended and the idea was that once inside I would lead her to some quiet part of the cinema for a little petting. I was pleased to see when I met her in town that she had a fairly short skirt on. She was as naïve as me so I wasn’t really planning anything too heavy, just the usual awkward adolescent fumbling, The skirt was a definite bonus. Once seated near the back, we sat and waited for the lights to dim. Just before the film started a couple came in and sat in our row just a few seats away. I was a little pissed off and considered moving but thought it might look a bit obvious. The couple were probably in their late 30s and I just assumed they were a fairly regular married couple. He was smartly but casually dressed and she wore a slightly flared button through dress just short of knee length. About fifteen minutes into the film I was aware of some movement out of the corner of my eye. To give you a mental picture the seating arrangement was me, my girlfriend, empty seat, empty seat, the woman, then the man. As I turned slightly to see what was happening I was a little shocked to see that the woman’s dress had ridden up and the man was stroking the inside of her thigh. As I continued to watch, his hand crept higher and higher until it was under her dress. At this point she slid down slightly in the seat and her knees parted a little more. He unfastened the bottom few buttons of her dress with his free hand and pulled it up so that now I had an unobstructed view of his hand slowly rubbing her through her panties. I had been so transfixed that I hadn’t noticed my girlfriend was now also watching the couple. I could actually hear the change in her breathing as she watched. She shifted in her seat and her legs slowly parted. Her hand dropped to the bottom of her skirt and slid beneath the hem. As the man rubbed his girlfriend through her knickers, so my girlfriend began to stroke herself in perfect time to him. As his fingers crept inside the leg of her knickers so I guessed my girlfriend’s hand had slipped inside her own. When I looked up I could see that he was looking directly into my girlfriend’s face. He was fingering my girlfriend in his mind and as his strokes increased and the woman started to move her hips in time to his fingers so my girlfriend’s strokes increased. I couldn’t believe what was going on. I just sat there unable to move. With his left hand he unzipped himself and hauled out his swollen cock glistening with pre cum. My girlfriend caught her breath. Whilst maintaining the rhythm of his fingering, he began to pull on his cock, each stroke making it longer and harder. He adjusted his position slightly and as his fingering became more urgent, so too did my girlfriend’s. The woman was thrusting up now towards him. She grasped his engorged cock with her right hand and started to pump it vigorously. My girlfriend was still keeping time but now her breath was coming in short sobs until finally the woman shuddered to a climax so hard I could feel it through the back of my seat. My girlfriend stifled a tiny scream as she came herself and almost simultaneously a thick jet of spunk squirted from the guy’s rigid cock and then another. My girlfriend, the spell broken, self consciously pulled down the hem of her skirt and sat back trembling in her seat. God knows if anyone else in the cinema saw. The couple discretely tidied themselves up before enjoying a long lingering and ostentatious french kiss, the man still looking over periodically towards my girlfriend. Five minutes before the end of the film the couple slipped out of the cinema. We waited until the end of the film to leave. After kissing my girlfriend goodbye in town I walked home only stopping to wank behind the bus shelter. I came in seconds. We never spoke of the incident but our unexpected sexual awakening led to a fantastic sex life until we parted the following spring.