Looking at the sign pairing here - Virgo's mutable earth detail orientation meeting Sagittarius' mutable fire spontaneity is honestly one of the more workable mutable-mutable combos, since you're both naturally adaptable once you find a shared process.

What tends to help is giving the Sagittarius partner room to think out loud first, then circling back for the practical details a Virgo needs to feel secure. Talk first, plan second, in that order, and the friction usually eases.

omg this is my parents lol. my dad (sag) talks in circles until my mom (virgo) starts writing things down mid conversation. 30 years later it still works somehow

the talk it out loud vs want a plan thing is so accurate. my ex was the same combo reversed (me sag, him virgo) and honestly once i started giving him a heads up before big conversations instead of springing them on him it got so much easier