[There'd be nothing unfair about it but she also loves sleeping with her hair open. Not that Usagi plans to sleep anytime soon but the point is that she is used to having her hair open while she is in bed... Nanoha doesn't have to do anything, and if Usagi goes too far in her opinion, then Nanoha can say it and Usagi will stop. Her hands start roaming a little, then a lot, all over her but she keeps their touches very light too at least for now.]