What’s the best way

Do a bit of work at your mother's house and tell her that you need to shower

Forget to take a towel into bathroom or shower then shout her to bring one to you making sure your hard as hell and just stand there waiting for her. Let us know what at happens

Engraved Invitations

Do it in your bedroom with the door wide open. Make a lot of noise while you're doing it (grunting, groaning, etc.). Maybe she'll give you a blow job. I assume that's what you're hoping for.

Do it at the dinner table

LOL

Stand over her while she and yiur dad are asleep. But that'd get ya an ass whooping and mental health appointments most likely. Best way is don't ever fuck ya mom and keep sex separate from your relationship.

LOL x 10....that was funny :)