last line in first paragraph: change the ‘it’? Peaky? you mean peaked. It seems she cheated on him with a voice over the phone while in her own bed. You might clear that up. Otherwise, you did have a good intruder, plus all the energy and jittery nerves shine through!
Pillow talk and talking during sex (on the phone or otherwise) should be taken with a grain of salt. Saying ‘I love you’ during these circumstances translates to ‘I love to f**k you’ imo.
But it’s still unfaith isn’t it. Deriving sexual pleasure from another individual? And I think it could be o.o like a gentle gaze which evokes a great emotional reaction is intense… right? >< and yeah :/ so true about the guilt