Lost in Two Lives, Until Reality’s Dream Finally Shattered

I'm Out of Books to Read. No Purity-Pairing Romance, Please. Both Leads Should Be Strong and Flirtatious, With Plenty of Heat.

From the Start, Born Into a Top-Tier Family and Immediately Made the Era's Holy Son or Divine Child, with an Invincible Divine Physique!

Fantasy, preferably with a System.