“As a matter of interest, what were you thinking about?” Remus asked with great curiosity.
Harry was a little tired from the spell but as he sat down on the step into Remus’ office he responded, “It’s not happy exactly. I mean, it is. But it’s...complicated. It isn’t just happy but safe as well. It’s the safest I’ve ever felt…” He trails off caught up in the memory.
Remus contemplated whether or not to ask more before Harry continued of his own volition. “She had hair that strangely enough looked closer to white or silver and the bluest eyes I can remember seeing.” A small smiler slipped across his face. “She was holding me in my crib and talking, simply, talking. I’m not even sure what she was saying but I felt warm...safe.”
He paused for a moment before continuing, “I’m still not sure if it’s real or not.” He turned to look at his professor. “You were one of my parents’ best friends, do you know who the girl could have been?”
“As a matter of fact, I might.”
Alternative
“As a matter of interest, what were you thinking about?”
“The first time I rode a broom.”
“That’s not good enough, Harry, not nearly good enough. You need something more powerful, pure, primal even...” Remus trails off trying to describe it best.
“Sorry, I’m a little lacking when it comes to happy memories. Should I just go out, drag a girl into a broom closet, and snog her or something?” He asks incredulously.
“As your teacher no.” A small smirk appears on his scarred face, “As your friend, that could be the very thing you need to succeed with the patronus.”
Thus commences Harry’s attempts to get a memory powerful enough to fuel a patronus.