Lisa smiled up at Mareth, her grin showing her approval, and dove back into pleasuring Sylvia.  They continued like this for nearly two hours, constantly teasing the elf to several orgasms, until it was clear she was too weak to continue.  "Well, I think she's had enough," Lisa said with a laugh as she started to untie Sylvia's legs.  "But you know... I haven't felt anything for myself..." she continued, giving Mareth a seductive smile.  "What do you say we let her rest and continue with just the two of us?"