Rider listened to Shirou's explanation, glad that he had found a way to keep himself alive without resorting to "traditional prana transfer". She was rather amused, though, by how flustered, not to mention aroused, he got when mentioning that Rin had used such methods with her alternate self. She, of course, was not remotely surprised by this, since she had been sexually involved with Rin herself for some time.
Whilst Shirou was responding, she saw Sakura's face darken, before she brightened up once more when she realised Shirou had not had sex with Rin in her absence. Then, suddenly, she grabbed hold of Shirou, attempting to spin him around, but quickly lost her balance and fell to the floor. This dod not, however, affect her happy mood. However, it did seem to increase her urgency even further, and she asked Rider to summon her Pegasus in order to fly them back home.
Rider simply smiled in response.
"Of course, Sakura", she said, overjoyed to see her happiness, before changing back into her battle outfit, summoning her weapons and performing the summoning.
There was a bright flash of light as the flying horse appeared in front of her, the hole in its wing now healed sufficiently for it to be able to fly without difficulty. Rider stroked its mane gently as she waited for Sakura and Shirou to board their ride home.