Mom walked in on us! (Edited to answer questions)

So, to answer some questions:

1. No, he didn’t get a chance to finish, because she walked in and he hurried to cover himself.

2. Yes, we’re 19 and that isn’t considered much of an adult, but I’ve been living out of her house for almost a year. She convinced me to move back in a month ago, which created some problems for him and I.

3. He’s handling it as well as he can, considering what she’s done since then... she has continuously slut shamed me in person and through text and told me I’m being disrespectful to myself (among other things). She’s tried everything she can to make me want to break up with him (“he’s only using you as an object” “he doesn’t respect you” she’s even kicked me out with nowhere to go because I “live in a way” they don’t agree with) Then she told my very religious friends mom, who then told my friend, who THEN told my other friends. So now I’m shunned. My mother uses this as a way to make me feel shamed (“if you’re not ashamed or embarrassed [for having sex] why is it such a big deal if they know?”). He doesn’t like how it’s affecting me, and he also doesn’t like the slut shaming. For himself, he’s fine. But he’s very protective of me and doesn’t like to see me hurt.

So my boyfriend and I are both 19. He’s staying at my house for a couple days because he lives out of state, and tonight we were fooling around (mouth & hands only) and my mom walks in, shines a flashlight at us and says to me “you might want to get out”. Him and I were both in complete shock. No clue how long she’d been standing outside the door, but she was obviously prepared to barge in. It may just be the shock, but I’ve been laughing about it for the past hour! She has since tagged me in a post on fb so I know she isn’t TOO mad. But still... I don’t know why I find it so hilarious. When she walked in I had my mouth AND hands put to work... probably the most embarrassing position for me. My mom is also super religious so she’ll probably have a bible verse or five to share with me in the morning. The situation shouldn’t be this funny to me, but I am an adult and we aren’t being stupid about it, so what harm have I done? I will apologize for doing it in her house but I’m not ashamed of myself. He’s the only guy I’ve really even kissed, and the only guy I plan to kiss from here on out. We’re planning on getting married in the spring (she does not know this yet). Just thought I’d share my first truly embarrassing sex experience.