entertwine
to enter someone or something then become entwined and wrapped up in each other.
“Hm Ruggles, we are so entertwined. Kiss me.
entertwined
Enter. The. Twine. And thus get entangled. As "in the twine." And therefor unable to get untangled.
The two people were so entertwined, it seemed they could never get enough of each other.