With her resistance broken the mans arms sink deep into the mare. Guided into her depths by the gentle contractions. Getting up to his elbows quickly he pushes harder felling her walls spasm around him. His upper arms disappear into her folds until his head is just outside her vagina. Stunned, he still cant feel her cervix against his finger tips, it must be just outside his reach.  Attempting to push forward he meets new resistance blocking him from advancing. Her walls have suddenly become a vise! He wonders to himself. "Are the drugs not strong enough??"  If they have already passed through her system he was going to need to be creative to loosen her back up.