Seeing the surprising suddenness of Catria pushing deeper into your tentacle, you keep it level to where she was. Though you do slowly tilt your tentacle so gravity could handle taking Catria into yourself fully, your stomach letting out a gentle growling that both you and Catria could hear.
Her feet disappear into the tentacle’s maw, as you feel her slowly sliding down towards your stomach. She’s not struggling or trying to stop herself. She seems to just be enjoying herself.