At which point, the best way to deal with sex toys is to gift them only in the privacy of the specific girl's bedroom, or in Null's bedroom. Make it an event where Null and the girl in question have an evening of fun and playing around with the new toy. They can discuss how it works, go over some ideas of when they might use it. Null might even suggest getting them butterfly panties and teasing them with the idea of making them wear them on a date. Getting sex toys open up the possibility of intimate events with the girls, not just "Put this on while we have sex", for example:
- Null slowly trailing a vibrator across Laura's skin for the first time, helping Laura find her erogenous zones.
- Null playing a game with Rogue by getting her to wear a vibrator and edging her to orgasms, and peppering her with kisses. She cums, she loses.
- Null driving Jean wild by playing with his big sis by tying her to the bed and leaving a wand against her pussy and stripping off for her.
These are just ideas off the top of my head.