Spit in her mouth, so she can then combine my spit and hers and slobber it all over my dick.
If she runs out if spit, I can spit in her mouth and provide more.
I dont usually spit in or on the pussy, I prefer to use saliva as lubricant for finger play in and around her asshole.
There have been times my FWB wanted to get fucked but was not wet enough yet, thats the only time i have spitted in her pussy before ramming my dick inside of her.