His shoulders are pressed against her rump taking several deep breaths he prepares himself before replying "Pretty soon you wont be able to get me out unless I want out!" Using both his legs and arms deep inside her he slowly advances forward inch by inch. His shoulders slowly stretch her open. Her brown rump is pushed apart and the chains on her legs jangle. While she cant kick backward they are set up so that she can spread her legs. His solid shoulders force her to adjust her stance spreading herself as wide as she can. With a wet pop his shoulders slide into her.