That liquid is currently tagged as cum, and it certain looks like it, which invalidates this as yuri.

-__- if it only was condensed milk ...

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...No, just no. Sperm banks do NOT work that way.

She spilled it on her breasts from the cup she's holding. That would be somewhat silly if it were cum (c'mon cum in this cup here so I can spill it on my breasts later and let my lesbian girlfriend lick it), which means it probably isn't cum but something like... say, sweet condensed milk, to encourage the licking.