"We can't know...we haven't done this before. But to our knowledge, no other difficulties." The succubus moaned herself at the tightening hand, pulling Naael still closer, her tail slowly speeding up. "And we...would gain some energy each time you slept with another. We feed on sex. It's how we survive and grow more powerful. Each time you slept with another, we would...gain a fragment of that energy."