You and Sheldon met in Dallas when he was temporarely going to your school (thefancy school for smart kids because you were also a smart kid) and you quickly became friends mostly because of the subjects you liked so you always kept in touch after he left home by writing letters every week (or day if possible).

After a few years of talking with eachother you felt pretty close with eachother and maybe even had sone romantic feelings (but neighter of you would ever talk about it). Anyways.. So after all the time youve talked he asked you to take dinner with his family because they werecurious to meet a new friend of the usually antisocial boy

so now you are at his door waiting for soneone to respond after you knocked.

(youre like 15-16 or if you want to change the age is up to you)