Firstly, well done, this is so great, I’m delighted.
Secondly if you do actually cum from penetration for the first time, let’s all be happy about that and count it as a win! You can have the one, just don’t do it again.
Thirdly, a dildo is absolutely your best friend at this point. Get one
Finally, ‘holes’ is plural for a reason.
Good girl, let us know how you get on!