Burning sensation

Ive been playing with my ass hole for sometime now. I recently had a sore bum from pooing too much and wiping too much. Now that im feeling better ive started feeling a burning sensation. Currently using a new lube and got myself a 19 inch dildo. Im not sure why its burning now. Im not allergic to anything not sure if the long dildo is causing the pain or the new lube. Now ive been using butter for a year as I ran out of Vaseline and was horny and used some butter (margerine) because I needed something inside me. Its been awesome as lube and never had an issue. Please help missus has gone away and im wasting viagra trying to keep an erection during anal play.

Side note I never seem to get a proper erection. It always stays soft even though ive been cumming. Im assuming its cum the videos definitely look to be cum. Other times its wee with a milky colouring. Never had a guy inside me so never been told im doing something wrong. Sorry if my questions are wierd ive had a few beers after quitting for 2 years and a bit tipsy.

Every time I assume I cum I feel the need to play with my asshole a few minutes later and cum again. This is handsfree. After I wank though and its definitely proper cum I still sometimes feel way horny again. One time I came 3 times hand free and once wanking within the hour