Hi Customer (name blocked for privacy),
I don't think it was a"bad" lubrication, maybe you did not use enough lubrication. You should use a lubrication specifically made for intercourse, lubrications such as baby oil or other "around the house" type of lubricants can cause a reaction. You don't have to worry about the opening being unable to stretch, women can accomadate almost any size without a problem. The fact that it's been a while, it could be a "friction burn" from the rubbing back and forth, which like you mentioned will go away in a day or two, and probably will not happen every time you have intercourse. So don't let this stop you from having fun. ;)
I hope this helps and if you have any further questions, please let me know. Feel free to request me anytime you have a question. If this has helped, please click the green accept button.
Thanks
Lisa
If this has helped, remember to click the green accept button. Please talk to me before leaving negative feedback, my goal is to get you best answers possible. If you find my help worthy, bonuses are appreciated!