Inserting a big cock into my slutty lover's back hole

It's hard to believe that such a huge and long cock is trying to fit into her small pussy hole. As soon as she puts it in, she doesn't dare to pull it out because she's afraid she'll lose her ecstasy, so she keeps soaking it in her pussy until it's fully emptied before it's filled with pleasure. The semen has shot out, flooding the entire contracting part, along with the lubricants, creating more stimulation for each other, the feeling of being on top, sitting up and writhing forever in the horseback riding position, causing very sublime emotions.