did it only once in kensington with another guy companion, during a turkish party, in private flat.. i charged the normal price of an outcall (x) 4 men present at the time, video wearing a cat-mask extra @ 20% of the fee for each man. Cat mask asked because the whole scenario was online with other friends using skype,,,, and because you never know about hidden indoors cctv.
Other extra like glory holes, through the wardrobe and upside down stuff... another 20% additional...
The extra time was not charged,,, supposed to be there 3 hrs, but stayed 4,30min, and drunk, but all fine.
Conditions asked before meeting were: Deposit + paid food and drinks meals for 2 mates stationing in the nearby restaurant, calling every hour.
All went fine.