I Have A Good Reason To Back Home late

This morning, my colleague asked me to accompany her to a bathroom showroom on our lunchtime, because she planning to buy something for her new home. She wants to check out the price for bathroom sinks and other stuff. I think the half of hour lunch time will not enough for her to check out the detail of the stuff she interesting. Therefore, I suggest we go after working house; we can have dinner before visit those showrooms. She agreed, finally I have a good excuse not to back home so early. :p