Wetnurse

A woman breastfeeding and fingering her girlfriend at the same time...

Sadly pretty unstable/unpredictable. Works better on anime/hentai-oriented checkpoints.

QFG-Scale works best at 7.5 for me.

Additional keywords: "breastfeeding", "fingering", "breast sucking", perhaps "hair grab". if you don't want the fed person to reach out for the other, you might want to add "arms behind back" in the positives and/or "breast grab" in the negative. As some Checkpoints assume a tiny person to be on the receiving end, you might want to add a suitable negative there...