21 [M4A] Online/Germany - Wanna become a cuck

Hey everyone,

Looking for some advice on leveling up our bedroom dynamic without dropping a huge kink bomb.

I’m (21M) locked in a chastity cage a lot of the time, she (20F) makes me wear it to work and basically whenever she feels like it.

Our relationship is pretty firmly female-led; she gets what she wants and I’m into that. She doesn’t know about my full-on cuckolding fantasies yet, but she already loves teasing me during dirty talk.

She’ll humiliate me about my size (I’m about 12-13 cm / 4.7-5.1 inches) and say things like “I want the bigger cock” while grabbing our 19 cm (7.5 inch) dildo, which she very obviously prefers.

It feels like she’s naturally drifting into the dynamic on her own. I want to lean into that and start introducing some subtle cuck-style roleplay with the dildo .. without ever saying the word “cuck” or making it obvious I’ve been sitting on a massive kink.

There’s also this guy in her class who’s clearly into her. He’s brought her snacks, visited her at work, etc. She always played it down as “just being friendly.” He’s Arabic, a lot more dominant-looking, nothing like me. I used to get really jealous and pissy about it because of my own insecurity/low ego (she’s my first girlfriend and has way more experience than me, I often feel like I’m not in her league). We argued about him enough that she didn’t even invite me to her graduation… (where he was present ofc)
The fucked-up part? While I was getting mad, I was also jerking off thinking about them. A few days ago we got drunk and she spent the whole time teasing me about him. I ended up making her moan his name while I was fucking her. He came by her work again later and actually confessed his feelings; she told him she doesn’t feel the same!!

I’m still insanely insecure about all of it… and yet it turns me on. I genuinely don’t know if I actually want to be a cuck or if I’m just getting off on the jealousy/humiliation mix.

Today she snapped me a pic in short hotpants and a crop top with the text “Going out now.” I was at work and replied “Not in that outfit… just kidding.” She shot back “I will go out exactly like this and shop with your card” (she has my card).

Anyone been in a similar spot .. partner already teasing/humiliating and leaning FLR, but doesn’t know you’re secretly fantasizing about full cuck stuff? How did you introduce more explicit hotwife/cuck roleplay (especially with a dildo stand-in) without making it weird or tipping your whole hand?

Also open to clothed-pic tribute ideas if anyone’s offering.

Bulls welcome as well!!

Thanks.