Jordan Gratwick, 26, was left fitting and 'foaming at the mouth' in the garden of the large country house after taking a significant quantity of the drug.
He allegedly used ecstasy, also known as MDMA, in the summer house with couple Laima Sinka and Brandon Hersey, who he'd met for the first time that evening at a nightclub.
He then invited them back to his family's home in the picturesque village of Hartley Wintney, Hants.
The inquest heard the trio left Moo Moo's nightclub in nearby Fleet by taxi in the early hours of June 3 - stopping so Mr Gratwick could withdraw money from a supermarket cashpoint.
Police told the inquest they believed the cash may have been subsequently used to buy the MDMA, which they allegedly all took.
In a statement, Ms Sinka claimed that in the summer house Mr Gratwick asked if he could 'watch her and her boyfriend have sex' and that he also placed his hand on her thigh.
Ms Sinka said her boyfriend took exception and told Mr Gratwick, a keen bodybuilder, not to touch her, and the pair had a discussion in the garden while she was being sick.
In a statement, Ms Sinka said: 'He said he would like to watch Brandon and I having sex. He had his hand on my thigh and Brandon said not to touch me.'
Having gone outside, the pair returned and she added: 'Brandon and Jordan came back and Jordan was standing in the doorway.
'I wanted to leave, but Jordan prevented me by standing in the doorway.
'It appeared Jordan was not listening and he appeared to be spaced out.
'He put his hands around Brandon's neck. I was really scared because I thought Jordan was going to kill Brandon and rape me.'
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