Blindfolded, tied up in a sling, headphones with music in my ears (sensory deprivation), possibly gagged. Then have someone whore my hole out for a few hours (depending on how it goes) to whomever wants my hole. I'd take every load. I'd also be willing to be pissed in (preferably towards the beginning as to not waste loads in my hole) and pissed on (preferably towards the end, because I don't want to be soaked and freezing cold/uncomfortable).
During the unfortunate periods of not being fucked and seeded, I'd want a butt plug in my hole to keep the loads inside me. Then after the end, I want to be plugged as well. Poppers definitely, drugs could possibly be considered for the situation. I'd really want like 20+ loads minimum. The more the better, even better to have them leaking out of my hole during fucking, only to be caught in a bowl/bucket under to be re-injected into me.
I've thought about that situation often. There are plenty others in my mind as well!