If it helps......

My partner and I have been together quite a while and is one of those ladies that always says my cock is enough for her. Roughly just over 6 inches. She always cums and cums multiple times. But I have that desire to see her fucked by bigger and better cocks. I work away a lot so we bought a "clone a penis" set, for when I'm away.
She uses it most days when I'm away.

I ring her most nights to say goodnight, and on this one night she'd been out drinking with her friend, and she rang me when she came home and she was quite tipsy.
She loves dirty talk when she's being fucked but we've never had phone sex as such because she said it's pointless, and the dirty talk has always been what I'm doing to her, never anyone else.

Anyway this night, as we were talking she happened to say how horny she was, and I suggested when she went to bed to use my clone dildo. Then I was surprised to hear her say she'd like to use it now, while I was on the phone. Well of course I agreed and she went to fetch it.

All I can say is thank god for FaceTime!!! For the next 20-30 minutes I watched as she fucked herself stupid with my cock dildo. After she finished she looked really embarrassed, and said with me watching she felt like she was fucking somebody else. I asked ho she felt about that and she said she felt guilty. I asked her if it turned her on and sheepishly she nodded her head, quickly said goodnight and hung up.

I was home the following day and after fucking I asked her how she felt about the FaceTime phone call. She said she was still embarrassed, but she woke up in the night horny again and how to use the dildo again. I asked if she was thinking about someone but she said no, it just wasn't me. Of course I found this very encouraging.

After this I used to lie next to her and fuck her slowly with the clone dildo and tell her how dirty she looked while being fucked by another cock, and how much I enjoyed watching "his" cock (a slight slip of the tongue", fucking her. This really turned her on, but would never talk about it outside of bed.

Over the next couple of nights I used the dildo on her a lot whispering in her ear how I like to see it slide up her tummy and fuck her tits, and I slowly ran the tip of the dildo up her tummy and rubbed it around her nipples. And yes she loved it and pushed her tits together around the dildo, all the while whispering in her ear how dirty and sexy she looked.

The following night I did the same thing, fucking her with the dildo, but this time she reached for my cock and started wanking me. I did the same thing, and trailed the dildo up her belly onto her nipples and between her tits. I was rubbing the dildo up and down her tits and she continued wanking me, but this time with every stroke of the dildo, it went nearer and nearer to her chin, until it was going past her chin and touching her bottom lip.

She didn't open her mouth, but she didn't stop me either, and her grip on my cock got that little bit harder. I decide to go for it and took the dildo from between her tits and start to rub it against the whole of her mouth, she was still hesitant and still didn't open her mouth, but again didn't stop me.

I whispered in her ear that I wanted to see her suck "cock" and did she want to. After a few seconds she gently nodded and slowly opened her mouth and started licking the head of "his" cock. She took "him" in her mouth started sucking and it wasn't long before she took the dildo off me and had her hand around the shaft. I fingered her at the same time, and she cum very hard. This is now a regular part of our play.

Just waiting to start the conversation out of bed of bringing a real third into the bedroom.