Sagittarius on the inside, Pisces on the way in.
Your sun in Sagittarius (fire, mutable) is the engine — what burns at the centre, what adapts when you are at home in yourself. Your Pisces rising (water, mutable, ruled by Jupiter) is the door — the way you arrive in a room, the first read the world takes of you, the body you walk in.
Strangers tend to assume you are sensitive and tidal — that is the Pisces arriving first. Then they get to know you and discover the Sagittarius fire underneath, which can be a surprise — the cool surface hid a hot core.
Reads as Pisces until you trust them; then Sagittarius comes through. The mutable-mutable mix means you consistently adapts.