HALLOWEEN revellers returning from a night out were stunned when a woman in skimpy fancy dress boarded the bus and appeared to have sex with a fellow passenger.

The girl started reportedly writhing around on the man’s lap — while shocked passengers started taking pictures on their mobiles.

2 The X43 bus from Manchester to Burnley where a couple where snapped reportedly having sex Credit: News Group Newspapers Ltd

One image shows the amorous couple seeming not to care about the dozen spectators around them on the top deck.

The red-haired woman is seen facing forwards and using the seat in front to balance herself.

A witness on the X43 — which takes passengers from Manchester to Burnley, Lancs — has claimed the pair were having sex.

They said: "I got on the bus at the Moon Under Water stop in Manchester at around midnight. I was sat behind them.

"A group of girls in fancy dress got on and this bloke was sat on his own. This one girl with a short skirt on went over and sat on his knee. He put his hands on her.

"The next thing he was fiddling with his trousers and she was going up and down on top of him. They didn't even kiss each other.

"Everyone was laughing.

"Her mate was sat right next to her. They were all in fancy dress.

2 Ticket to ride . . . passengers stunned to see romp on bus to Burnley Credit: News Group Newspapers Ltd

"He had a wedding ring on. She definitely wasn't his wife with the way he was trying to pull her. He didn't do too bad.

"The people on the rows further behind couldn't see what they were doing. But those of us sat opposite could see. She didn't seem to [be bothered]. They didn't know everyone was watching, they thought it was a secret. They were both drunk, everyone was drunk.

"I don't think the bus driver was aware of what was going on as it was upstairs.

"The group of girls got off the bus in Burnley and the man walked off into town with them."

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The couple — who were strangers before the bus journey began — have now found themselves at the centre of a social media storm as people commented on their so-called midnight antics.

The post — which has since been deleted — attracted people’s attention after one user commented: “I wasn’t the only one getting a ride on the X43 last night!! Wow!”

A spokesman for bus firm Transdev said: “We are currently reviewing the CCTV to

investigate this incident.”