Your Sagittarius is a fellow fire sign, so you’ll have a worthy sparring partner to keep you on your toes. Best of all, they know when to back down.
This creates a perfect match for you emotionally, and the level of controlled competition is just what you need. The chemistry between you is awesome, and sex is likely to never get boring.
It’s important to note however that we’re looking only at sun signs here. There are many other planets which can have an equal or greater effect on someone’s personality. Makes sense, as ultimately everyone is of course unique. Generalizing too far based just on sun signs can therefore be misleading.
To fully understand someone or how compatible you are with them we need to calculate those other planet placements from their date of birth, and compare them to your own, and then interpret the results.
This unlocks the real power of astrology, and gives much more useful and specific information: everything from how they view you, how to turn them on, how to avoid arguments with them etc.