>>2516873If she already has dildos that are non-human colors (pink, purple, clear, etc) just buy a black one for her that's larger than her other one's. If she asks about it, tell her you thought it would be hot to see her really get stretched out and the black one was the cheapest at the bigger size.
Don't associate the new dildo with anything else. Let her make the connection on her own. As long as you don't jump the gun and get some comically large dildo and tell her to use it while watching blacked, if she actually is interested in having a passionate sexual relationship, she'll probably do what you ask. The key is to take things slow and act normal about it.
