It's quite low quality and /g/ would shoot me for mentioning it instead of some other alternative, but agnai.chat is free and doesn't even require a login. Use cards from
chub.ai or some other site to import characters and go nuts.
It has issues with moderately long responses though, even with custom configs to increase token count. Cut off text is frequent once responses reach a few paragraphs. For a quick fap it's decent however.