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Ritsuka is 99% sure none of her Servants can kill her. Even for the ones who would cut off their tie to the world - willingly or unwillingly - she has her Command Spells to keep them in line.
She is pretty sure she can still use them with her mouth occupied, so having her head between Barghest's gorgeous thighs is fine. And if it's not, it's worth the risk.
"Master…!" Barghest is trembling with the effort of holding still. Ritsuka has seen her crush a watermelon between her thighs, so she's grateful for the restraint.
She shows her appreciation with her tongue lapping over Barghest's folds, tiny flicks of tongue that make Barghest's toes curl. Barghest presses her hand to the back of Ritsuka's head, not hard enough to hurt but enough to demand more, more, more. Ritsuka obliges.
When she sucks on Barghest's clit, Barghest bites down on her other fist. Even that barely muffles her moans. Ritsuka doesn't think she'd mind if the whole Wandering Sea knew how good she was making Barghest feel right now, but her girlfriend is surprisingly shy sometimes. As long as Ritsuka knows, that's what's important.
And it's not hard to tell. Barghest's thighs on either side of her head tense more and more as Ritsuka works her up, light licks turning into longer strokes of tongue and joined by her fingers. Her hand in Ritsuka's hair is tight, pressing her firmly against herself. And her beautiful voice gushes forth in cries of Ritsuka's name and 'please' and 'yes'.
When she's close enough, her control slips. Her hips roll, smearing her wetness against Ritsuka's mouth. When that happens, Ritsuka just stays still and lets Barghest rut against her tongue until she's satisfied.
For about five minutes. The Fang Clan are known to be insatiable.